1. Cleaning and inspection of bearing bush: large motor bearings are packed and shipped separately. After unpacking, use lifting ring screws to take out the upper and lower tiles respectively, mark them, clean them with kerosene, dry them with dry cloth, and check whether all grooves are clean. Whether there is casting residual sand, tungsten gold layer and tile body combination is not good, the trench, cracks exist trachomatis and other doping, etc.), if it can not be repaired, it is necessary to hang tungsten gold again.
2. Cleaning and inspection of the bearing seat: before the installation of the bearing seat, comprehensive cleaning and inspection should also be carried out; The inner cavity of the bearing seat with a scraper to scrape the dirt, with a cloth dipped in gasoline or solvent to clean the dirt; Watch whether there are cracks and sand holes, in order to prevent oil seepage in operation, bearing cover and bearing seat joint surface, bearing seat and bearing oil ring joint surface should be scraped together; And check the gap with a feeler gauge should not be greater than 0.03 mm. , the bottom plate surface of the bearing seat should also be cleaned, and there should be no collision, rust and burr. Fastening the bearing seat screws and seat plate threads are to check him fine, and try to screw check whether too tight or bald buckle.
3. Insulating structure of bearing: insulating plate or metal gasket must be used between bearing and bottom plate. Metal spacers are used to adjust the horizontal position of the seat. To adjust the relative position of the motor and another motor or machine connected. The metal gasket is made of 0.08~3 mm metal sheet, the insulating pad is made of cloth laminate or glass fiber laminate, the purpose of placing the insulating pad is mainly to prevent the harm of the shaft current, the insulating pad should be 5~10 mm wider than the bearing seat each side, The thickness is 3~10 mm, in addition to the insulation pad placed between the bearing and the bottom plate, the screw and the stable nail should also be insulated, the insulation gasket is made of 2~5 mm thick glass fiber cloth board, its outer diameter is 4~5 mm larger than the outer diameter of the iron gasket. The tubing contact pad connected with the bearing seat can be made of 1~2 mm rubber sheet thickness, the insulation of the bearing seat after installation should be checked to the ground insulation resistance, with 500 volt megohm meter measurement, the resistance should not be less than 1 megohm.
The following are the problems that need to be paid attention to in the installation of motor bearings
Whether it is a single motor bearing and multiple bearings of the unit, should be installed on the main longitudinal axis of the connected machinery or the longitudinal axis of the unit, measuring the bearing center is checked by hanging steel wire and wire hammer, (a wooden strip is inserted in the bearing arc, and a thin iron strip is nailed in the center of the wooden strip, Sign center), adjust the position of the shaft were present from the edge of the bearing seat, use level on the bearing surface to check the flat levelness, using theodolite or level check several shaft seat plane in the same horizontal plane, and the methods of hammer with lines to align the bearing center is on the same axis. According to the above method for the adjustment of the bearing seat, in the process of eliminating the deviation, it is applied to the jack type tool to move the bearing seat, do not adopt the method of impact and hammer. By this method, the accuracy error of the bearing seat is about 0.5~1.0 mm. It should be pointed out that the installation and adjustment of the bearing seat is just a pre-adjustment, and it should be adjusted to meet the requirements of the axis line consistency when centering. After the presetting of the bearing seat, just tighten the screws evenly (according to the diagonal cycle tightening), while the insulation bushing and stable nail can be temporarily held, until the centering work is finally completed or before the test run.
Post time: Apr-14-2022